<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box1 {
            width: 0;
            height: 0;
            border-top: 100px solid transparent;
            border-right: 50px solid skyblue;
            border-bottom: 0 solid blue;
            border-left: 0 solid green;
        }

        .price {
            width: 160px;
            height: 24px;
            border: 1px solid red;
            margin: 0 auto;
            line-height: 24px;
        }

        .miaosha {
            position: relative;
            float: left;
            width: 90px;
            height: 100%;
            background-color: red;
            text-align: center;
            color: #fff;
            font-weight: 700;
        }

        .miaosha i {
            position: absolute;
            right: 0;
            top: 0;
            width: 0;
            height: 0;
            border-color: transparent #fff transparent transparent;
            border-style: solid;
            border-width: 24px 10px 0 0;
        }
    </style>
</head>

<body>
    <div class="box1">

    </div>
    <div class="price">
        <span class="miaosha">
            $1650
            <i></i>
        </span>
        <span>$5000</span>
    </div>
</body>

</html>